Installing PGND Cables and Power Cables

Prerequisites

• Cabinets have been installed.
• The power switches of output terminals on the power distribution cabinet (PDC) are set to OFF.
• All circuit breakers on the cabinet PDUs are set to OFF.
• Required materials are available, including power cables, PGND cables, cable ties, wax strings, and PVC insulation tapes.
• Required tools are available, including the diagonal pliers, cable cutter, Phillips screwdriver, multimeter, and ladder.

Context

PDU connectors are the IEC60309-32A-compliant standard plug and socket, as shown in Figure 5-11. The connector close to the PDU is a male plug, which has been connected to the PDU power cable before delivery. The connector close to a PDC is a female socket. On the installation site, you must connect the AC power cable of the PDC to the female socket and then connect the male plug to the female socket.

Figure 5-11 PDU connectors

Procedure

1. Route PGND cables and power cables.
   1. Read Site Survey Report to determine the cabling mode, route, and length of PGND cables and power cables.

      A cabinet supports both overhead and underfloor cabling. This section uses overhead cabling as an example to describe how to route cables.

   2. Use a cable cutter to cut off a cable of a proper length, as shown in Figure 5-12.
      Figure 5-12 Cutting a cable
      

   3. Attach temporary labels to both ends of the cable for identification.

      The content on temporary labels can be either customized or be the same as that on engineering labels.

   4. Route PGND cables and power cables neatly along a cable tray, and keep them a proper distance from terminals to which they are to be connected.

2. Install terminals for PGND cables and power cables.

   For details on how to prepare terminals for PGND cables and power cables, see Preparing Cables and Connectors.

3. Install PGND cables.
   1. On the ground bar of a PDC, use a Phillips screwdriver to remove screws from ground terminals. Then, fix PGND cables, as shown in Figure 5-13.
      Figure 5-13 Fixing PGND cables on the ground bar
      

      The tightening torque must match the OT terminal specifications.

   2. Use a Phillips screwdriver to unfasten the ground terminal screw on the top or bottom of the cabinet mounting bar and fix the other end of the PGND cable to the ground terminal.
      • In overhead cabling, fix the other end of the PGND cable to the ground terminal on the top of the cabinet mounting bar.
      • In underfloor cabling, fix the other end of the PGND cable to the ground terminal on the bottom of the cabinet mounting bar.

4. Lift the cabinet top cover to an angle of approximately 30 degrees and take out the PDU connectors.

   It is recommended that two persons collaborate to perform this operation.

   1. Pull the positioning pins on the top cover of the rear cabinet door slightly and push the cabinet cover upwards to an angle of approximately 30 degrees. See (1) in Figure 5-14.
   2. Lead the two PDU connectors out of the two cable outlets on the cabinet cover. See (2) in Figure 5-14.
   3. Restore the cabinet cover.
   Figure 5-14 Taking out PDU connectors
   

5. Connect a power cable to the PDU female socket.

   To prevent fatal personal injury, ensure that the power switch of the PDC that supplies power to the cabinet is off.

   1. Separate the male plug from the female socket. See (1) in Figure 5-15.
   2. Unlock the buckle in the middle of the female socket and disassemble the female socket by spinning it counterclockwise. See (2) in Figure 5-15.
   3. Route the power cable through the PDU female socket. Connect the live line (brown), ground line (yellow-green), and neutral line (blue) respectively to the L/+ jack, jack, and unidentified jack of the female socket. Use a Phillips screwdriver to fasten the screws on the female socket to secure those lines. See (3) in Figure 5-15.
   4. Assemble the two parts of the female socket and insert the male plug to the female socket. See (4) in Figure 5-15.
   Figure 5-15 Connecting a power cable to the PDU female socket
   

6. Connect the other end of the power cable to the wiring terminals of the uninterruptible power system (UPS) or AC PDC, as shown in Figure 5-16.
   Figure 5-16 Connecting power cables to a PDC